Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<style>
div {height:50px;width:100%;}
</style>
<body>

<h1>Gray can be set using equal values for all light sources</h1>

<div style="background-color:rgb(0,0,0)"></div>
<div style="background-color:rgb(64,64,64)"></div>
<div style="background-color:rgb(128,128,128)"></div>
<div style="background-color:rgb(192,192,192)"></div>

<h1 style="color:rgb(0,0,0)">Heading</h1>
<h1 style="color:rgb(64,64,64)">Heading</h1>
<h1 style="color:rgb(128,128,128)">Heading</h1>
<h1 style="color:rgb(192,192,192)">Heading</h1>

</body>
</html>